An allergy is an abnormal reaction to what would ordinarily be a harmless substance. This substance that triggers the allergic reaction is called an allergen, and may be swallowed, inhaled or through skin contact.

Causes and Allergy Triggers
The most common allergens include pollens, dust mites, food, plants, latex rubber, bacteria and conditions of the environment (like cold temperatures). Allergies can occur in one or more areas and may exhibit more than one symptom.

An allergic reaction occurs when the immune system mistakes a harmless foreign substance (allergen) as possibly harmful. The main cause of an allergy is yet to be discovered, however, it has been observed that allergies often run in the family. Meaning, a person who is allergic to a specific substance most likely has relatives who are allergic to that same substance. Aside from hereditary factors, non-hereditary factors play a significant part as well.

The most common allergies are non-allergic rhinitis, allergic dermatitis, urticaria, allergic rhinitis and asthma. Allergic rhinitis is a term used to refer to anyone who has symptoms which are based on allergies. Other terms for allergic rhinitis include pollen allergy or hay fever. This allergy is caused by tree pollens, weeds, grasses or mold spores. Asthma is caused by extrinsic and intrinsic factors. Intrinsic factors include pollens and dust mites while extrinsic factors include respiratory infections (like bronchitis or cough) and air pollutants. Eczema, also called allergic dermatitis, is primarily triggered by food. Contact dermatitis is triggered by being exposed to a specific type of plant, cosmetics, metals, medication and chemicals. Urticaria, or more popularly known as hives, is triggered by food or by certain medications.

The National Institute of Allergy and Infectious Diseases (NIAID) mentions that asthma and allergic diseases are common for all age groups in the US. Often travel to a new city can cause allergies to flare. Travel insurance comes in handy if symptoms get worse and one has to see a doctor. One can pick a popular affordable plan to cover such situations.

People suffer from many diseases and one of these problems is allergy. A person may be allergic to many things. There can be food items that may be responsible for the allergy or some non living thing or even living things as pets.
The food allergies are caused by eating any particular food item and as a result the body reacts to it. This is a sign that the person is allergic to that food and should avoid it. Because if the allergic item is not avoided it can cause serious problems and in worst cases death. People can be allergic to milk, eggs, wheat, fish, nuts etc.
If you suffer from any of the above allergies you should strictly avoid these things in your daily routine. Milk allergic should avoid milk and all products that are made from milk. This is because even a slight amount of milk can cause allergic reactions to start. Similarly many people are allergic to eggs specially the white part.

If you do not take precautions you can suffer from stomach disorders, vomiting and even breathing problems. A very common type of allergies is the pollen allergy. It causes damage to the lungs gradually causing them to become weak. The patients suffer breathing and coughing problems continuously.

The best way to treat an allergy is to get proper medication for it. Many medications are available that block the cells in the body that react to allergies and cause a reaction. The most common are antihistamines.

Immuno therapy is also a treatment available to treat allergic patients. The patient is subjected to different antibodies that in the long run make him tolerant to allergy causing substances in the blood. The antigens may be taken orally to provide a greater amount of resistance.
This was some information about various allergies and allergy medication.